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NOTES PAYABLE AND CREDIT AGREEMENTS (Details) (USD $) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Laclede Gas [Member] Line of Credit [Member] | Sep. 03, 2013 Laclede Gas [Member] Line of Credit [Member] bank | Sep. 30, 2013 Laclede Group [Member] Line of Credit [Member] | Sep. 03, 2013 Laclede Group [Member] Line of Credit [Member] | Sep. 30, 2013 Laclede Group [Member] Commercial Paper [Member] | Sep. 30, 2012 Laclede Group [Member] Commercial Paper [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility borrowing capacity |  |  |  | $ 450,000,000 |  | $ 150,000,000 |  |
Banks in syndicated line of credit facility |  |  |  | 9 |  |  |  |
Banks in syndicated line of credit facility, largest borrowing portion provided by a single bank |  |  |  | 15.60% |  |  |  |
Minimum required ratio of earnings before interest, taxes, depreciation, and amortization (EBITDA) times interest expense as required by the line of credit covenant. |  |  |  | 70.00% |  | 70.00% |  |
Debt to total capitalization ratio |  |  | 48.00% |  | 49.00% |  |  |
Weighted average borrowings outstanding |  |  |  |  |  |  | 34,200,000 | 43,800,000
Weighted average interest rate |  |  |  |  |  |  | 0.30% | 0.30%
Short term borrowings outstanding in the period - minimum |  |  |  |  |  |  | 0 | 0
Short term borrowings outstanding in the period - maximum |  |  |  |  |  |  | 99,400,000 | 133,500,000
Borrowings outstanding at end of period | $ 74,000,000 | $ 40,100,000 |  |  |  |  | $ 74,000,000 | $ 40,100,000
Weighted average interest rate at period end |  |  |  |  |  |  | 0.30% | 0.20%

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